Summary:
{See also Red-pored Boletus Table.} This name probably represents two species in the Pacific Northwest, neither of which are described yet (N. Siegel, pers. comm.). Features include dark brown cap, bright red to orange pores, and granular rather than reticulate [netted] stem that is not bulbous. The current name of the species in Europe in the Index Fungorum and MycoBank, each accessed February 9, 2019, is given as Sutorius luridiformis (Rostk.) G. Wu & Zhu L. Yang, but the need to use that genus name is disputed.

Chemical Reactions:
cap surface red with KOH but quickly darkening, flesh yellow to pale orange with KOH, (Thiers), cap surface dark amber with application of KOH and dark olive-green with FeSO4, flesh slowly olivaceous with application of FeSO4, blued surface bleached yellow then white with KOH, (Bessette)

Odor:
not distinctive (Bessette), often pungent, unpleasant, (Thiers)

Taste:
not distinctive (Bessette), often pungent, unpleasant, (Thiers)

Microscopic:
spores 13-16 x 4.8-5.5 microns, subcylindric to subfusoid [somewhat cylindric to somewhat spindle-shaped], smooth, dark ochraceous in Melzer''s, ochraceous in KOH, moderately thick-walled; basidia 4-spored, 18-24 x 7-10 microns, colorless, contents granular in KOH; hymenial cystidia scattered to numerous, sometimes embedded, 39-45 x 9-11 microns, "subclavate with tapering apices to basidioid, often heavily incrusted and staining bright ochraceous in KOH", occasionally colorless and apparently not incrusted; clamp connections absent, (Thiers), spores 12-16 x 4.5-6 microns, subfusoid, smooth, ochraceous, (Bessette)

Spore Deposit:
olive brown (Bessette), ochraceous brown (Thiers)

Notes:
Neoboletus ''luridiformis'' is found in northeastern North America west to CA, north to AK, (Bessette), OR (vouchered at University of Washington), and WA (Buck McAdoo, pers. comm. from H. Thiers). It has been reported from BC (C. Roberts, pers. comm.), and from NS (Grund).

EDIBILITY

poisonous, causing gastrointestinal distress (Bessette), rated edible by some, but red pores serve as a warning of poisonous species, (Thiers), poisonous to some people (Arora)